<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>

		<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
	</head>
	<body>
		<div id="app">
			{{num}}
			<br />
			<input type="text" v-model="num" />
			<br />
			{{message}}
			<br />
			{{result}}
		</div>

		<script>
			var app = Vue.createApp({
				data() {
					return {
						"message": "Hello Vue!",
						"num": 10,
						"result": 0
					}
				},

				methods: {

				},

				watch: {
					num(newVal, oldVal) {
						console.log("旧的值" + oldVal)
						console.log("新的值" + newVal)
						this.message = "监听到num数据改变了，旧的值" + oldVal + "新的值" + newVal

						var worker = new Worker("longtask.js")


						worker.onmessage = (event) => this.result = event.data;


						worker.postMessage(newVal)





					}
				}

			});
			var vm = app.mount("#app")
		</script>



	</body>
</html>
